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There are many kinds saw blade, diamond saw blade and carbide saw blade. You should choose the saw blade according to the application, like wood, metal, stone, concrete, wall and so on.
any saw is the opposite of the way the blade spins!
Unscrew the handle to relive the tension on the saw. Remove the old blade, hook the new blade over the pins on the saw and tighten the handle back up.
There is a great new glossary for circular saw blades here: http://www.toolstoday.com/t-saw-blades-glossary.aspx The Toolstoday Saw Blade Glossary defines the many different saw blade terms that you need to know when you purchase, or start working with saw blades.
Rip saw blades require a greater kerf to prevent the pinching of the blade by the stock.
coated blade creates less friction/binding/heat. coated blade less likely to leave burn mark on wood due to blade overheating
There are many multi-tools on the market that do have a small saw blade on them.
Hack saw, coping saw.
Turn off all power to the circular saw and remove the power cord from the wall outlet. Twist tie or tie off the cord to keep it out of the way while changing the blade,Slide up the protective blade guard to expose the blade. Lay the saw down on a sturdy bench top.,Clamp the circular saw to the bench top using two bench clamps or any clamp that will hold the unit securely to the bench. , Locate the hole in the saw blade itself. This hole will be drilled all the way through the blade and can accommodate a drill bit or another thin piece of metal or wood. Place a drill bit through the hole in the saw blade to secure the blade from moving. Many newer circular saw models come equipped with a blade lock feature that can be employed to stop blade movement .Attach a wrench or socket to the circular saw blade retaining bolt in the center of the blade. This bolt attaches the blade to the saw itself. Remove bolt and set aside. Remove the saw blade and place the new blade in its place. Replace the blade bolt and tigh
You loosen the holding nut and remove it, then remove the blade, exactly the way you do on any table saw.
a concrete or masonry blade
A power saw and a shaving machine are some of the things with a blade.